ESP8266 BearSSL MQTT Exception when connecting - mqtt

Question

I am trying to connect to HiveMQ MQTT Broker from my ESP8266, 2 months ago, this code works fine, but now, when I implement more features, the code run with a lot of Exceptions. Sometimes, Exception (28), I'm newbie in this fields and don't know the way to handle it, thanks for your helps.
RAM and Flash:
Exception:
Sometimes:
My Code:
void setup()
{
BearSSL::WiFiClientSecure *bear = setSSLCertificate();
PSclient = new PubSubClient(*bear);
MQTT_ADDRESS = cEEPROM.getMqttAddress();
MQTT_PORT = cEEPROM.getMqttPort();
PSclient->setServer(MQTT_ADDRESS.c_str(), MQTT_PORT);
PSclient->setBufferSize(512);
PSclient->setCallback(myCallback);
}
void loop()
{
wifiConfig.configWifiAP(ENV_SSID_AP, ENV_PASS_AP);
if (!PSclient->connected())
{
reconnect();
}
else
{
PSclient->loop();
}
}
}
void reconnect()
{
while ((!PSclient->connected()) && tryConnectPS <= 5)
{
setDateTime();
String MQTT_ACCOUNT = cEEPROM.getMqttAccount();
String MQTT_USERNAME = cEEPROM.getMqttUsername();
String MQTT_PASSWORD = cEEPROM.getMqttPassword();
Serial.print("Try to connect to MQTT... ");
if (PSclient->connect(MQTT_ACCOUNT.c_str(), MQTT_USERNAME.c_str(), MQTT_PASSWORD.c_str()))
{
Serial.print("Connected state:");
Serial.println(PSclient->state());
String MQTT_TOPIC = cEEPROM.getMqttTopic();
boolean result = PSclient->subscribe(MQTT_TOPIC.c_str());
Serial.print("Tinh trang subscribe topic: ");
Serial.println(result);
tryConnectPS = 0;
DeviceService::turnReadyLedOn();
return;
}
else
{
Serial.print("Failed,rc = ");
Serial.println(PSclient->state());
Serial.println("Try again in 2 seconds ... ");
delay(1000);
tryConnectPS++;
}
}
}
BearSSL::WiFiClientSecure *setSSLCertificate()
{
LittleFS.begin();
int numCerts = certStore.initCertStore(LittleFS, PSTR("/certs.idx"), PSTR("/certs.ar"));
Serial.printf("So chung chi CA : %d\n", numCerts);
if (numCerts == 0)
{
Serial.printf("KHONG TIM THAY CHUNG CHI NAO");
}
BearSSL::WiFiClientSecure *bear = new BearSSL::WiFiClientSecure();
bear->setCertStore(&certStore);
return bear;
}
Full exception:
--------------- CUT HERE FOR EXCEPTION DECODER ---------------
Exception (28):
epc1=0x40205f0d epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000
stack>>>
ctx: bearssl
sp: 3fff3690 end: 3fff3a80 offset: 0190
3fff3820: 3ffe8cc1 3fffbd6c 3fffb7f4 40205ef4
3fff3830: 4021bb04 00000000 000003e8 4021ad84
3fff3840: 00000000 00000000 00000000 40213640
3fff3850: 00000000 00000000 3fff116c 4021bb04
3fff3860: 00000000 000003e8 3ad6faec 00000000
3fff3870: 00000000 00000000 40213640 00000000
3fff3880: 00000000 3fff116c bd2fdbf6 925dd89d
3fff3890: c6b3dd59 2f7b7dde 0c3e3fec bc6117ef
3fff38a0: 572033bf f8302d1e 0001d90a 0000056f
3fff38b0: 928b6852 b5d6e5dc d07ddae3 3fffa404
3fff38c0: 3fffa428 3fffae04 000003dd 4023efe6
3fff38d0: 4026ed46 eb148196 203ddbd5 d3597ea7
3fff38e0: f958f8e2 cd48b85b 164f5cfe 551efe29
3fff38f0: 11c8af23 7cea8db0 2f179093 09a2acfd
3fff3900: f03f4647 ffb7b0e9 32684d28 1e5e67d6
3fff3910: 4026f0a7 00000000 00000b80 00000000
3fff3920: 3fffa41c 3fffac04 3fffa4d4 0000001a
3fff3930: 3fffa434 3fffa430 c818691e 0a857cc3
3fff3940: 56789534 54be83d2 466dbc59 1ce0b490
3fff3950: 3416a5e4 0b8510a4 5d8f434c 59ff5645
3fff3960: 3fff6072 0000002a 3fff6072 00000683
3fff3970: 3fff5ad4 3fff52d4 3fff5ab8 4023f682
3fff3980: 3fff5adc 3fff52d4 3fff5ab8 40239cb0
3fff3990: 402083e4 3fff52d4 3ffffdf0 00000004
3fff39a0: 4026d679 00000005 00000000 fffffffe
3fff39b0: 00000000 3fffc6fc 00000000 3fff4b3c
3fff39c0: 0000f811 00000000 3fff11d8 00000030
3fff39d0: deadbeef deadbeef 4026da73 deadbeef
3fff39e0: 3fff5ad8 3fff5b5c 3fff5ad4 deadbeef
3fff39f0: deadbeef 3fff52b8 0000001a 3fff5db8
3fff3a00: 0000001a deadbeef deadbeef deadbeef
3fff3a10: deadbeef deadbeef deadbeef 3fff5dd4
3fff3a20: 000005c2 3fff5cd4 3fff52d4 40237e44
3fff3a30: 3fff5ab8 deadbeef deadbeef deadbeef
3fff3a40: 00000250 00000005 deadbeef 3fff11d8
3fff3a50: 00000000 00000000 3fff52d4 40238439
3fff3a60: 00000100 deadbeef deadbeef deadbeef
3fff3a70: deadbeef 00000000 3fff4b3c 402093b8
ctx: cont
sp: 3ffffde0 end: 3fffffc0 offset: 0000
3ffffde0: 00000000 00000000 00003a98 40208400
3ffffdf0: 000005c2 6e00c440 c4c69916 284c5820
3ffffe00: 00000008 00000001 000024a9 00000000
3ffffe10: 40238f4c 40238f9c 3fff52d4 4023858a
3ffffe20: 3fff57d4 3fff4d44 3fff52d4 3fff4d44
3ffffe30: 00000000 00000001 3fff4b3c 40208453
3ffffe40: 00000000 00000001 3fff4b3c 40208643
3ffffe50: 40105b5d 3fff135c 3fff135c 000000c9
3ffffe60: 00000000 00000000 000022b3 4021733a
3ffffe70: 00000000 3fff4b3c 3fff4cd4 4020746e
3ffffe80: 3fff5194 00000010 3fffff5c 3fff45f4
3ffffe90: 000022b3 3fff4d44 3fff4b3c 3fff45f4
3ffffea0: 000022b3 3fff4d44 3fff4b3c 402086e5
3ffffeb0: 4021bbac 9e5c4936 4021bbac 9e5c4936
3ffffec0: 00000000 3fff4c94 3fff4cbc 4021a08a
3ffffed0: 00000000 3fff4c94 3fff4cbc 4020b3e8
3ffffee0: 3ffe88ec 3fff135c 00000005 000000a4
3ffffef0: 00000000 3fffff74 00000000 00000000
3fffff00: 00000001 3ffe88d2 3fff11a0 40214c34
3fffff10: 40214c28 3ffe88d2 3fff11a0 3fff0f30
3fffff20: 3fff0c48 3fff0d44 3fff11a0 4020b5d0
3fffff30: 00000000 00000000 00000001 402150d0
3fffff40: 3fff0c48 3fff0d44 3fff11a0 4020575a
3fffff50: 3fff0f30 00000001 3fff0c54 3fff4cbc
3fffff60: 000f000f 8a003837 3fff4c94 0012001f
3fffff70: 8a003439 36384d53 4a4b3252 0a003439
3fffff80: 3fffdad0 3fff0d44 3fff0c3c 3fff12f4
3fffff90: 3fffdad0 00000000 3fff0d44 40205b09
3fffffa0: 3fffdad0 00000000 3fff12e0 40216d40
3fffffb0: feefeffe feefeffe 3ffe8650 40100dd9
<<<stack<<<
--------------- CUT HERE FOR EXCEPTION DECODER ---------------
I expect to a successful and stable connection to MQTT Broker